CN108496040B - Radiant tube burner apparatus - Google Patents
Radiant tube burner apparatus Download PDFInfo
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- CN108496040B CN108496040B CN201780007810.1A CN201780007810A CN108496040B CN 108496040 B CN108496040 B CN 108496040B CN 201780007810 A CN201780007810 A CN 201780007810A CN 108496040 B CN108496040 B CN 108496040B
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- combustion
- exhaust gas
- radiant tube
- gas
- fuel gas
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 227
- 239000007789 gas Substances 0.000 claims abstract description 189
- 239000002737 fuel gas Substances 0.000 claims abstract description 87
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 15
- 229930195733 hydrocarbon Natural products 0.000 description 15
- 150000002430 hydrocarbons Chemical class 0.000 description 15
- 239000000567 combustion gas Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/126—Radiant burners cooperating with refractory wall surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C99/00—Subject-matter not provided for in other groups of this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/66—Preheating the combustion air or gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
- F23J2215/101—Nitrous oxide (N2O)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion Of Fluid Fuel (AREA)
- Gas Burners (AREA)
- Air Supply (AREA)
- Chimneys And Flues (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A radiant tube burner apparatus is provided with a radiant tube burner which supplies a fuel gas and combustion air to a combustion part at one end of a radiant tube, wherein the combustion part burns the fuel gas in the radiant tube and discharges the burnt gas from the other end of the radiant tube, and an exhaust gas treatment part containing a three-way catalyst is provided at a position on the downstream side of the radiant tube in the discharge direction of the burnt gas.
Description
Technical Field
The present invention relates to a radiant tube burner apparatus including a radiant tube burner which supplies a fuel gas and combustion air to a combustion portion at one end of a radiant tube, burns the fuel gas in the radiant tube in the combustion portion, and discharges a burned exhaust gas from the other end of the radiant tube. It is characterized in particular by the following points: in the radiant tube burner apparatus, when the fuel gas and the combustion air are supplied to the combustion portion, the fuel gas is burned in the radiant tube, and the burned combustion gas is discharged to the outside from the other end portion of the radiant tube, the combustion exhaust gas can be prevented from being discharged to the outside in a state where the combustion exhaust gas contains harmful nitrogen oxides (hereinafter, referred to as NOx), CO gas, or unburned component gas such as hydrocarbon gas (HC).
Background
Conventionally, in an industrial heating furnace, a heat treatment furnace, or the like, a radiant tube burner device having a radiant tube burner has been used in order to prevent oxidation of an object to be heated caused by flame contact with the object to be heated when the object to be heated is heated.
In such a radiant tube burner apparatus, a fuel gas and combustion air are generally supplied to a combustion portion at one end of the radiant tube, the fuel gas and the combustion air are mixed in the combustion portion, the fuel gas is combusted in the radiant tube, and a combustion exhaust gas after the combustion is discharged from the other end of the radiant tube.
Here, in the radiant tube burner, when the fuel gas is mixed with the combustion air in the combustion portion and the fuel gas is combusted in the radiant tube as described above, if the air ratio μ (actual air amount/theoretical air amount) is controlled to 1.0 or less to reduce the amount of the combustion air with respect to the fuel gas and the combustion is conducted so as to reduce NOx contained in the combustion exhaust gas, a large amount of unburned component gas such as CO gas or Hydrocarbon (HC) gas remains in the combustion exhaust gas, and the unburned component gas is discharged to the outside from the other end portion of the radiant tube, which is problematic in terms of safety and environment.
On the other hand, if the amount of combustion air relative to the fuel gas is increased and the air ratio μ is made to exceed 1.0 for combustion, although the remaining of unburned gas in the combustion exhaust gas is suppressed, a large amount of NOx is generated during combustion, and the combustion exhaust gas containing a large amount of NOx is discharged from the other end portion of the radiant tube to the outside, which causes a serious environmental problem. In particular, in recent years, it has been strongly demanded to greatly reduce NOx in combustion exhaust gas.
Therefore, in recent years, as shown in patent document 1, the following proposals have been made: the combustion exhaust gas from the radiant tube burner is purified by a nitrogen oxide reduction catalyst, and after adding combustion air to the obtained NOx purified gas so that the air ratio becomes 1.0 or more, unburned components are oxidized and removed by an oxidation catalyst.
Here, in the solution shown in patent document 1, it is necessary to provide a first exhaust gas treatment unit housing a nitrogen oxide reduction catalyst and a second exhaust gas treatment unit housing an oxidation catalyst, and to supply air between the first exhaust gas treatment unit and the second exhaust gas treatment unit, and therefore, there is a problem that the apparatus is complicated and large in size.
In addition, it is well known that: as one method of exhaust gas treatment, CO, HC, and NOx, which have adverse effects on safety, environment, human body, and the like, are oxidized and reduced to H by a three-way catalyst2O、CO2、N2And (4) purifying.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2001-241619
Disclosure of Invention
Technical problem to be solved by the invention
The present invention is directed to solving the problems described above in a radiant tube burner apparatus including the radiant tube burner: the radiant tube burner is a combustion part for supplying a fuel gas and combustion air to one end of the radiant tube, and the combustion part burns the fuel gas in the radiant tube and discharges the burnt gas from the other end of the radiant tube.
That is, in the radiant tube burner apparatus of the present invention, when the fuel gas and the combustion air are mixed in the combustion portion, and after the fuel gas and the combustion air are combusted in the radiant tube, the combustion exhaust gas is discharged to the outside from the other end portion of the radiant tube, it is possible to appropriately prevent the combustion exhaust gas from being discharged to the outside in a state where the combustion exhaust gas contains harmful unburned component gases such as NOx, CO gas, or Hydrocarbon (HC) gas.
Technical scheme for solving technical problem
In order to solve the above-described problems, in a radiant tube burner apparatus having a radiant tube burner, an exhaust gas treatment unit accommodating a three-way catalyst is provided at a position on a downstream side in a discharge direction of combustion exhaust gas of the radiant tube; the radiant tube burner is a combustion part for supplying a fuel gas and combustion air to one end of the radiant tube, and the combustion part burns the fuel gas in the radiant tube and discharges the burnt gas from the other end of the radiant tube.
Therefore, in the radiant tube burner apparatus, NOx contained in the combustion exhaust gas is reduced by the unburned component gas contained in the combustion exhaust gas using the three-way catalyst accommodated in the exhaust gas treatment section. In this case, if the air ratio μ is set to 1.0 or less by reducing the amount of combustion air with respect to the fuel gas when the fuel gas and the combustion air are supplied to the combustion portion, the amount of NOx generated during combustion is reduced, the NOx contained in the combustion exhaust gas is reduced, and the NOx contained in the combustion exhaust gas is further sufficiently reduced by the unburned component gas contained in the combustion exhaust gas using the three-way catalyst.
In the radiant tube burner apparatus of the present invention, a fuel gas guide passage and a control element are preferably provided; a fuel gas guide path for guiding a part of the fuel gas supplied to the combustion section to a position upstream of the exhaust gas treatment section in a discharge direction of the combustion exhaust gas; the control element controls the amount of fuel gas guided through the fuel gas guide passage.
Here, in the control unit, the amount of the fuel gas guided through the fuel gas guide passage is controlled in accordance with the amount of nitrogen oxides contained in the combustion exhaust gas.
Therefore, when the fuel gas and the combustion air are supplied to the combustion portion as described above, the combustion gas is combusted in the combustion portion in a state where the amount of the combustion air relative to the fuel gas is increased, and as a result: in the case where a large amount of NOx is contained in the combustion exhaust gas, an appropriate amount of fuel gas is supplied by the control element before being introduced into the exhaust gas treatment unit accommodating the three-way catalyst through the fuel gas guide passage. In this case, the combustion exhaust gas containing a large amount of NOx is introduced into the exhaust gas treatment unit together with an appropriate amount of fuel gas, and the NOx in the combustion exhaust gas is sufficiently reduced and discharged by the action of the three-way catalyst.
In the radiant tube burner apparatus of the present invention, it is preferable that the post-combustion device is provided at a position on a downstream side in a discharge direction of the burned gas from the exhaust gas treatment section; the post-combustion device burns unburned gas contained in the combustion exhaust gas discharged from the exhaust gas treatment unit. If so, even if the unburned gas remains in the combustion exhaust gas treated by the exhaust gas treatment unit, the unburned gas is burned by the post-combustion device and oxidized to CO2And H2O, the discharge of unburned gas can be prevented.
In the radiant tube burner apparatus of the present invention, it is preferable that a heat exchange element for heating combustion air by using heat of the combustion exhaust gas is provided, and the combustion air heated by the heat exchange element is supplied to the combustion portion. Thus, the heat of the combustion exhaust gas can be effectively utilized to perform combustion with high efficiency.
ADVANTAGEOUS EFFECTS OF INVENTION
In the radiant tube burner apparatus of the present invention, when the fuel gas and the combustion air are supplied to the combustion portion, the fuel gas is combusted in the radiant tube, and the combusted combustion gas is discharged from the other end portion of the radiant tube, as described above, the combustion exhaust gas is introduced into the exhaust gas treatment portion housing the three-way catalyst, and unburned components made of harmful NOx, CO gas, or Hydrocarbon (HC) gas in the combustion exhaust gas are appropriately treated.
The result is: in the radiant tube burner apparatus of the present invention, when the fuel gas is mixed with the combustion air and burned in the radiant tube, the NOx and the unburned gas in the combustion exhaust gas are appropriately treated in the exhaust gas treatment section, and the combustion exhaust gas is appropriately discharged to the outside in a safe state in which the combustion exhaust gas does not contain NOx and unburned gas.
Drawings
Fig. 1 is a schematic explanatory view showing a state in which a radiant tube burner apparatus of a first embodiment of the present invention is used.
Fig. 2 is a schematic explanatory view showing a state in which a radiant tube burner apparatus of a second embodiment of the present invention is used.
Fig. 3 is a schematic explanatory view showing a state in which a radiant tube burner apparatus of a third embodiment of the present invention is used.
Fig. 4 is a schematic explanatory view showing a state in which a radiant tube burner apparatus according to a fourth embodiment of the present invention is used.
Fig. 5 is a schematic explanatory view showing a state in which a radiant tube burner apparatus according to a fifth embodiment of the present invention is used.
Detailed Description
Hereinafter, a radiant tube burner apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The radiant tube burner apparatus of the present invention is not limited to the following embodiments, and can be implemented with appropriate changes within a range not changing the gist of the present invention.
Here, in the radiant tube burner apparatus of the first embodiment, as shown in fig. 1, a radiant tube formed in a U shape is used as the radiant tube 11 in the radiant tube burner 10, and the radiant tube 11 formed in a U shape is arranged inside the furnace 1. On the other hand, both ends of the radiant tube 11 are extended to the outside of the furnace 1 through the furnace wall 1 a. The shape of the radiant tube 11 is not limited to the U shape, and may be a known shape such as a W shape or an I shape.
In this embodiment, a fuel gas such as Hydrocarbon (HC) gas is supplied to the combustion portion 12 on one end side of the radiant tube 11 through the fuel gas supply tube 21, and combustion air is supplied through the combustion air supply tube 22, so that the fuel gas and the combustion air are mixed in the combustion portion 12, the fuel gas is combusted in the radiant tube 11 in the combustion portion 12, and the combusted combustion exhaust gas is discharged from the other end portion of the radiant tube 11.
In this embodiment, an exhaust gas treatment unit 23 containing a three-way catalyst is provided at the other end of the radiant tube 11 that discharges the combustion exhaust gas, and the combustion exhaust gas that has been combusted in the radiant tube 11 is introduced into the exhaust gas treatment unit 23 and treated.
Here, in the radiant tube burner apparatus, when the fuel gas and the combustion air are supplied to the combustion portion 12 through the fuel gas supply pipe 21 and the combustion air supply pipe 22, in order to reduce the amount of NOx generated at the time of combustion, the amount of the combustion air with respect to the fuel gas is reduced, for example, the air ratio μ is set to 1.0 or less, and the fuel gas is burned in the combustion portion 12.
If the combustion is performed with the amount of combustion air reduced with respect to the fuel gas, NOx contained in the combustion exhaust gas is reduced, and unburned component gases such as CO gas and Hydrocarbon (HC) gas remain in the combustion exhaust gas.
Therefore, if the combustion exhaust gas containing residual NOx and unburned components is introduced into the exhaust gas treatment unit 23 provided on the radiant tube 11 on the downstream side in the discharge direction of the combustion exhaust gas, the residual NOx and unburned components in the combustion exhaust gas react with each other by the three-way catalyst accommodated in the exhaust gas treatment unit 23, and NOx is reduced to N2While unburned gas is oxidized to CO2And H2The state of O is discharged.
Here, when the combustion exhaust gas containing residual NOx and unburned gas is treated by the three-way catalyst accommodated in the exhaust gas treatment unit 23 in this manner, the amount of combustion air relative to the fuel gas decreases, and the unburned gas in the combustion exhaust gas increases, so that the combustion exhaust gas containing residual unburned gas may not be sufficiently treated by the three-way catalyst accommodated in the exhaust gas treatment unit 23, and may be discharged from the exhaust gas treatment unit 23.
For this reason, in the radiant tube burner apparatus of the second embodiment, as shown in fig. 2, in the radiant tube burner apparatus of the first embodiment, the post combustion device 24 is provided at a position on the downstream side in the discharge direction of the burned gas from the exhaust gas treatment section 23. The post-combustion fuel gas is supplied to the post-combustion device 24 from a post-combustion fuel gas supply pipe 24a, and the post-combustion air is supplied to the post-combustion device 24 from a post-combustion air supply pipe 24b, as required.
Therefore, in the radiant tube burner apparatus of the second embodiment, the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas treatment unit 23 is combusted in the post-combustion device 24, and the unburned component gas is oxidized to CO2And H2And discharging after O.
Therefore, even if the unburned gas is not sufficiently treated in the exhaust gas treatment unit 23 and the combustion exhaust gas having the unburned gas remaining therein is discharged from the exhaust gas treatment unit 23, the unburned gas is subjected to combustion treatment in the post-combustion device 24, and the discharge of the unburned gas can be reliably prevented. In the present embodiment, the post-combustion device 24 that burns the unburned gas remaining in the combustion exhaust gas by flame is used, but the post-combustion device 24 is not limited thereto, and the unburned gas remaining in the combustion exhaust gas may be burnt by electric heating or the like.
Then, in the radiant tube burner apparatus of the third embodiment, as shown in fig. 3, in place of the combustion air supply pipe 22 for supplying combustion air to the combustion part 12, a heat exchange part (heat exchange element) 25a, a combustion air guide pipe 25b, and a heating combustion air supply pipe 25c are provided in the radiant tube 11 on the exhaust side of the combustion exhaust gas of the radiant tube 11 for introducing the combustion exhaust gas into the exhaust gas treatment part 23; the heat exchange portion 25a heats combustion air by the heat of the combustion exhaust gas; the combustion air guide duct 25b guides combustion air to the heat exchanging portion 25 a; the heating combustion air supply pipe 25c supplies the combustion air heated by the heat exchange portion 25a to the combustion portion 12.
Therefore, in the radiant tube burner apparatus of the third embodiment, as described above, the combustion air is introduced into the heat exchange portion 25a through the combustion air guide tube 25b, the combustion air is heated in the heat exchange portion 25a by the heat of the combustion exhaust gas, the thus heated combustion air is supplied to the combustion portion 12 through the heated combustion air supply tube 25c, the thus heated combustion air and the fuel gas are mixed in the combustion portion 12, and the fuel gas is burned in the radiant tube 11.
In this case, when the fuel gas is mixed with the combustion air and combusted, the heat of the combustion exhaust gas can be effectively used. In this way, in the heat exchange portion 25a, the temperature of the combustion exhaust gas introduced from the radiant pipe 11 into the exhaust gas treatment portion 23 is lowered by performing heat exchange between the combustion exhaust gas and the combustion air, and thus the temperature of the combustion exhaust gas can be prevented from exceeding the temperature range in which the three-way catalyst accommodated in the exhaust gas treatment portion 23 is used, and the combustion exhaust gas can be appropriately treated by the three-way catalyst. In this embodiment, the heat exchange portion 25a is provided inside the radiant tube 11, but the heat exchange portion 25a may be provided outside the radiant tube 11.
Next, in the radiant tube burner apparatus of the fourth embodiment, as shown in fig. 4, in the radiant tube burner apparatus of the first embodiment, a fuel gas guide passage 26 and a control valve (control element) 26a are provided; the fuel gas guide passage 26 guides a part of the fuel gas supplied to the combustion portion 12 through the fuel gas supply pipe 21 to a position on the upstream side in the discharge direction of the combustion exhaust gas from the exhaust gas treatment portion 23; the control valve 26a controls the amount of the fuel gas guided to the upstream side in the discharge direction of the combustion exhaust gas from the exhaust gas treatment unit 23 through the fuel gas guide passage 26.
Therefore, in the radiant tube burner apparatus of the fourth embodiment, the amount of the fuel gas guided through the fuel gas guide passage 26 is controlled by the control valve 26a in accordance with the amount of NOx contained in the combustion exhaust gas after combustion in the combustion portion 12.
Here, when the fuel gas and the combustion air are supplied to the combustion portion 12 through the fuel gas supply pipe 21 and the combustion air supply pipe 22, if the amount of the combustion air is increased, for example, the air ratio μ is set to exceed 1.0, and the fuel gas is combusted in the combustion portion 12, the fuel gas is combusted with a sufficient amount of the combustion air, so that unburned component gases such as CO gas and Hydrocarbon (HC) gas in the combustion exhaust gas can be reduced, while NOx is generated in a large amount during combustion, and the combustion exhaust gas contains a large amount of NOx.
Therefore, when the combustion exhaust gas contains a large amount of NOx, the amount of the fuel gas guided to the upstream side in the discharge direction of the combustion exhaust gas from the exhaust gas treatment unit 23 through the fuel gas guide passage 26 is controlled by the control valve 26a, and an appropriate amount of the fuel gas is supplied to the upstream side in the discharge direction of the combustion exhaust gas from the exhaust gas treatment unit 23 and is introduced into the exhaust gas treatment unit 23 containing the three-way catalyst together with the combustion exhaust gas containing a large amount of NOx. In this case, NOx in the combustion exhaust gas reacts with the fuel gas by the action of the three-way catalyst accommodated in the exhaust gas treatment section 23, and NOx is reduced to N2While oxidizing the fuel gas to CO2And H2The state of O is discharged.
Then, in the radiant tube burner apparatus of the fifth embodiment, as shown in fig. 5, in the radiant tube burner apparatus of the fourth embodiment, as shown in the radiant tube burner apparatus of the second embodiment, a post-combustion device 24 is provided at a position on the downstream side in the discharge direction of the combustion off-gas from the off-gas treatment section 23, and as shown in the radiant tube burner apparatus of the third embodiment, a heat exchange section 25a, a combustion air guide pipe 25b, and a heating combustion air supply pipe 25c are provided at a portion on the discharge side of the combustion off-gas of the radiant tube 11 that introduces the combustion off-gas into the off-gas treatment section 23; the heat exchange portion 25a heats combustion air by the heat of the combustion exhaust gas; the combustion air guide duct 25b guides the combustion air heated by the heat exchanging portion 25 a; the heating combustion air supply pipe 25c supplies the combustion air heated by the heat exchange portion 25a to the combustion portion 12.
Therefore, in the radiant tube burner apparatus of the fifth embodiment, similarly to the radiant tube burner apparatus of the third embodiment, the combustion air is introduced into the heat exchange portion 25a through the combustion air guide tube 25b, the combustion air is heated in the heat exchange portion 25a by the heat of the combustion exhaust gas, the thus heated combustion air is supplied to the combustion portion 12 through the heated combustion air supply tube 25c, the heated combustion air and the fuel gas are mixed in the combustion portion 12, and the fuel gas is burned in the radiant tube 11.
In this case, when the fuel gas is mixed with the combustion air and the fuel gas is combusted, as described above, the heat of the combustion exhaust gas can be effectively utilized, and the temperature of the combustion exhaust gas introduced from the radiant tube 11 into the exhaust gas treatment unit 23 is lowered, so that the temperature of the combustion exhaust gas can be prevented from exceeding the temperature range in which the three-way catalyst accommodated in the exhaust gas treatment unit 23 is used, and the combustion exhaust gas can be appropriately treated by the three-way catalyst.
In addition, in the radiant tube burner apparatus of the fifth embodiment, if the amount of the fuel gas guided through the fuel gas guide passage 26 is increased, more than the NOx in the combustion exhaust gas is reduced to N2When a required amount of fuel gas is introduced into the exhaust gas treatment portion 23, the combustion exhaust gas containing residual unburned gas is discharged from the exhaust gas treatment portion 23. In this case, similarly to the radiant tube burner apparatus of the second embodiment, the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas treatment unit 23 is burned in the post-combustion device 24, and the unburned component gas is oxidized to CO2And H2And discharging the O.
Description of the symbols
1: furnace with a heat exchanger
1 a: furnace wall
10: radiant tube burner
11: radiant tube
12: combustion section
21: fuel gas supply pipe
22: air supply pipe for combustion
23: exhaust gas treatment unit
24: post-combustion device
24 a: fuel gas supply pipe for post combustion
24 b: air supply pipe for post combustion
25 a: heat exchange part (Heat exchange element)
25 b: air guide pipe for combustion
25 c: air supply pipe for heating combustion
26: fuel gas guide path
26 a: control valve (control element)
Claims (5)
1. A radiant tube burner apparatus comprising a radiant tube burner which supplies a fuel gas and combustion air to a combustion portion at one end portion of a radiant tube, wherein the combustion portion is configured to burn the fuel gas in the radiant tube by setting an air ratio [ mu ] to 1.0 or less, and to discharge a burned exhaust gas after the combustion from the other end portion of the radiant tube, wherein an exhaust gas treatment portion accommodating a three-way catalyst is provided at a position on a downstream side in a discharge direction of the burned exhaust gas of the radiant tube, and a post-combustion device is provided at a position on the downstream side in the discharge direction of the burned exhaust gas from the exhaust gas treatment portion; the post-combustion device burns unburned gas contained in the combustion exhaust gas discharged from the exhaust gas treatment unit.
2. A radiant tube burner apparatus according to claim 1, wherein nitrogen oxides contained in the combustion exhaust gas are reduced by the unburned component gas contained in the combustion exhaust gas using a three-way catalyst accommodated in the exhaust gas treatment section.
3. A radiant tube burner apparatus as in claim 1 wherein a fuel gas guide and control element are provided; a fuel gas guide path for guiding a part of the fuel gas supplied to the combustion section to a position upstream of the exhaust gas treatment section in a discharge direction of the combustion exhaust gas; the control element controls the amount of fuel gas guided through the fuel gas guide passage.
4. A radiant tube burner apparatus according to claim 3, characterized in that the amount of fuel gas guided through the fuel gas guide passage is controlled by the control element in correspondence with the amount of nitrogen oxides contained in the combustion exhaust gas.
5. A radiant tube burner apparatus according to any one of claims 1 to 4, wherein a heat exchange element for heating combustion air by the heat of the combustion exhaust gas is provided, and the combustion air heated by the heat exchange element is supplied to the combustion section.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016051223A JP6525908B2 (en) | 2016-03-15 | 2016-03-15 | Radiant tube burner equipment |
| JP2016-051223 | 2016-03-15 | ||
| PCT/JP2017/003321 WO2017159079A1 (en) | 2016-03-15 | 2017-01-31 | Radiant tube burner equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108496040A CN108496040A (en) | 2018-09-04 |
| CN108496040B true CN108496040B (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780007810.1A Active CN108496040B (en) | 2016-03-15 | 2017-01-31 | Radiant tube burner apparatus |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6525908B2 (en) |
| KR (1) | KR102549148B1 (en) |
| CN (1) | CN108496040B (en) |
| TW (1) | TWI686569B (en) |
| WO (1) | WO2017159079A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT520134B1 (en) * | 2017-07-13 | 2020-03-15 | Andritz Tech & Asset Man Gmbh | METHOD FOR REDUCING NITROGEN OXIDES IN TAPE TREATMENT OVENS |
| US11668056B2 (en) * | 2017-08-09 | 2023-06-06 | Oriental Yuhong Waterproof Technology Co., Ltd. | Burner and locomotive for spreading waterproof coil in hot melt manner |
| CN109338052A (en) * | 2018-09-29 | 2019-02-15 | 中冶南方（武汉）热工有限公司 | Reduce the radiant tube exhaust system and method for discharged nitrous oxides |
| CN113137604A (en) * | 2021-05-01 | 2021-07-20 | 大庆华凯石油化工设计工程有限公司 | Cracking furnace attaches high-efficient low NOx burner of wall |
| JP2023176186A (en) | 2022-05-31 | 2023-12-13 | 中外炉工業株式会社 | Industrial furnace exhaust system |
| GB2621855A (en) * | 2022-08-24 | 2024-02-28 | Amtech As | Combustor |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5327042B2 (en) * | 1973-07-09 | 1978-08-05 | ||
| US5500194A (en) * | 1994-05-04 | 1996-03-19 | Petrocon Technologies, Inc. | Hybrid low NOx process for destruction of bound nitrogen compounds |
| JP3370839B2 (en) * | 1996-01-23 | 2003-01-27 | 日本碍子株式会社 | Radiant tube burner and atmosphere firing furnace using the same |
| JP2001241619A (en) * | 2000-03-01 | 2001-09-07 | Osaka Gas Co Ltd | Method for purifying flue gas in radiant tube burner |
| JP2014031923A (en) * | 2012-08-02 | 2014-02-20 | Osaka Gas Co Ltd | Radiant tube burner |
| CN103255271A (en) * | 2013-05-21 | 2013-08-21 | 北京科技大学 | Gas dual-cycle radiant tube heating device |
| CN103868066A (en) * | 2014-03-20 | 2014-06-18 | 北京科技大学 | Multi-stage combustion radiant tube heating device |
| JP6125055B1 (en) * | 2016-01-15 | 2017-05-10 | 中外炉工業株式会社 | Combustion treatment equipment |
-
2016
- 2016-03-15 JP JP2016051223A patent/JP6525908B2/en active Active
-
2017
- 2017-01-31 CN CN201780007810.1A patent/CN108496040B/en active Active
- 2017-01-31 KR KR1020187016355A patent/KR102549148B1/en active IP Right Grant
- 2017-01-31 WO PCT/JP2017/003321 patent/WO2017159079A1/en active Application Filing
- 2017-02-16 TW TW106105048A patent/TWI686569B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017159079A1 (en) | 2017-09-21 |
| JP6525908B2 (en) | 2019-06-05 |
| CN108496040A (en) | 2018-09-04 |
| TW201736776A (en) | 2017-10-16 |
| TWI686569B (en) | 2020-03-01 |
| KR20180122315A (en) | 2018-11-12 |
| KR102549148B1 (en) | 2023-06-28 |
| JP2017166731A (en) | 2017-09-21 |
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